Revert of Version 5.0.71.10 (cherry-pick)

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 680 matching lines @@
                       r6);
   if (cc == eq) {
     StringHelper::GenerateFlatOneByteStringEquals(masm, lhs, rhs, r5, r6);
   } else {
     StringHelper::GenerateCompareFlatOneByteStrings(masm, lhs, rhs, r5, r6, r7);
   }
   // Never falls through to here.
 
   __ bind(&slow);
 
+  __ Push(lhs, rhs);
+  // Figure out which native to call and setup the arguments.
   if (cc == eq) {
-    {
-      FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-      __ Push(lhs, rhs);
-      __ CallRuntime(strict() ? Runtime::kStrictEqual : Runtime::kEqual);
-    }
-    // Turn true into 0 and false into some non-zero value.
-    STATIC_ASSERT(EQUAL == 0);
-    __ LoadRoot(r4, Heap::kTrueValueRootIndex);
-    __ sub(r3, r3, r4);
-    __ Ret();
+    __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals);
   } else {
-    __ Push(lhs, rhs);
     int ncr;  // NaN compare result
     if (cc == lt || cc == le) {
       ncr = GREATER;
     } else {
       DCHECK(cc == gt || cc == ge);  // remaining cases
       ncr = LESS;
     }
     __ LoadSmiLiteral(r3, Smi::FromInt(ncr));
     __ push(r3);
 
@@ skipping 5139 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC